If it's not what You are looking for type in the equation solver your own equation and let us solve it.
z in (-oo:+oo)
z/2.65 = -7.48 // + 7.48
z/2.65+7.48 = 0
0.37735849*z+7.48 = 0 // - 7.48
0.37735849*z = -7.48 // : 0.37735849
z = -7.48/0.37735849
z = -19.82200003
z = -19.82200003
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